Abstract
Cross sections have been measured for the ionisation of Ga+ by energy-resolved electrons ( Delta E=0.1 eV) with energies between threshold at 20.51 eV and 41 eV. There was good agreement with the measurements of Rogers et al (1982) who reported very strong contributions from indirect ionisation, but the enhanced energy resolution of the present measurements enabled much more structure in the ionisation function to be resolved. This structure is compared with the photoionisation cross sections of Ga+ of Peart et al (1989) and with the calculations of autoionisation by Pindzola et al (1982). The calculations reproduced some autoionisation features quite accurately but optically permitted transitions were found to contribute less to ionisation than was predicted.
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